One year old biting her twin- what to do?

I have one year old girls. One of my daughters keeps biting her sister. Everything I have read talks about the biter being fustrated or stressed- I dont think that is the case. I think she is biting bc she is teething and her sister is right there! I have tried laying plenty of teethers and chewable toys around. I catch her most of the time before it happens. I think they are starting to understand NO, and she certainly understood when I sat her by herself. I try to explain- but sometimes she just laughs at me when I discipline her. I have read to bite her- but that seems counter-productive- if I do it, it must be okay. I have read not to bite her too! I am not biting my child regardless!!! lol Argh.

Honestly I ended up biting my younger son when we hit the biting phase. I just got so frustrated with him. It's not OK behavior and it's not tolerable. I've heard many methods but I think you just have to be persistent on it. I wish I had some advise but I literally did choose to bite my son back lol.

My twins are nearly 7 and Eli would bite Peyton for toys usually and then P would bite back. I would just tell them no biting and eventually they started biting themselves to get the other in trouble. They were still biting until age 5. I say they ate the best of friends but also the best antagonizers to each other. I never dealt with buyers before despitey older 2 being only a little over 2 years apart.

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